Shedding mechanism for looms



ly 1953 E. PFARRWALLER SHEDDING MECHANISM FOR LOOMS 5 Sheets-Shet 1Filed Sept. 16, 1948 IN V EN TOR. fen 0v 1 5416? WAZA ER.

A T TOP/V5 Y.

July 7, 1953 E. PFARRWALLER 2,644,488

SHEDDING MECHANISM FOR LOOMS Filed Sept. 16, 1948 5 Sheets-Sheet 2 F: CA. 5/ 87 80 79 JNVENTOR. fem/v ZAPEW/M 1 54''! July. 1953 E.PFARRWALLE-R 2,644,488

SHEDDING MECHANISM FOR LOOMS Filed Sept. 16, 1948 5 Sheets-Sheet 5 July7, 1953 E. PFARhWALLER 2,644,488

SHEDDING MECHANISM FOR LOOMS Filed Sept. 16, 1948 5 Sheets-Sheet 4'INVENTOR. [em/v PFAEfiW/MLE/F.

ATTORNEY- July 7, 1953 E. PFARRWALLER SHEDDING MECHANISM FOR LOOMS 5Sheets-Sheet 5 Filed Sept. 16, 1948 INVENTOR. 5PM flfimee/rnz4sz.

Patented July 7, 1953 uNiTEDfsrATEs r 2,644,488 SHEDDING MECHANISMLEO-It LOOMS Erwin Pfarrwaller, Winterth-ur, Switzerland, as-

signor to Sulzer-Freres, Societe Anonyme', Winterthun. Switzerland, acorporation. of: Switzerland Y Applicatiim Septemlier. 16,1948, SerialNo. 49,469

In Switzerland September 20; 1947 cries-6s). 4'

- are claims.

The present invention relatesfto a shedding mechanism or dobby which'positively operatesthe heddles or harnesses looms for weaving,

i. e. raises them as well-as depresses them.

A n obj ect of theinvention is the provisionof a shedding-mechanism inwhich the heald framesare actuated by an operating} lever which'ispositivel y' oscillated two-opposite directions,- one for raising"'a-nd -nefor depressing the heald frames, by an oscillating'ca-m.= The.latter isos cillated b'y a reciprocating movementof two actuati-ngmembers piveted' thereto. The reciprocating movement is imparted to saidmembers byactuating bars which are continuously recipr'o-- cated andtemporarily individually connected to said members when actuationthereof is desired. An object of the'i'nventicnis the provision of amechanism for bringing about-engagement and disengagement oftheactuatingbars with-the actuating members at predetermined operati-ng conditionsof'the'l'oom and in dependence on a pattern card. Themechanismco'mprisesa two-arm switching lever and link members individually pivoted to:onearmof said lever and to always one of the actuating members. Theswitching lever-has two-predeterminedoperating positions and is switchedfrom-one position to the other and vice-versa' by a control rod which isrecipro catingly moved by continuously reciprocatingly moving: draw barswhich engage and actuatesaid rod at desired periods of 100m operation.The

rod is swung toandout of engagement with a-lways one ofsaid drawbarsby-a' lever'means the position of which is controlled by' a pattern cardfeeler-d'epen ding from the lever means. *A further object oftheinvention is the provisionof means for displacing the fulcrum of thelever means for positioning the control rod simultaneously'with theactuation of lifter means forl'i'fting the cardfeeler dependingfrom saidlever means, from thepa'ttern card. 1

1 An object of the invention is the provision of interdependentandfsuitably-timed drive means for. positively reciprocating theactuating barsforthe cam actuating members, for positively reciprocatingthedraw bars for the control rod actuatingthe switching lever, forpositively reciprocating'the card.fee1er.- lifter; and the-shaftsupporting theleverv means for" positioning the control rod, and foradvancinga drum support.- ing the pattern card. I v

Further. andiother objects, of the present invention willv behereinafter set forth in the accomwhat I now consider to be preferredembodiments of the invention. a Q

In the drawings: Fig.1 shows, diagrammatically and in sidezelee vation,a. section through a dobby according to.

the invention, with a sidewall removed;

- Fig.2'is a diagrammatic sectional side view of ajiportion of the.dobby according to the inven 51011;. v: V

Figs-'3' and 4' are diagrammatictop'views of the dobby according to theinvention with. the driving members-for the individual harness leversand otheriparts of themechanism omitted Fig. 5 is a diagrammatic sideview of a mechanism according to- "the invention for actuating thepattern card drum and the lifters for the card feelers I Fig. 6isa-front view of the mechanism shown in Fig. 5; V

Figs. 7 to 13 are diagrammatic sectional side views of the mechanism foroperating theharness levers, in different operating positions;

Fig. 14 is alarge scale illustration of a detail ofthemechanismaccording to the invention;

Fig. 15 illustrates. diagrammatically, an alternative arrangement forarresting: the cam disc of the mechanism. according to the invention;

Fig. 16 illustrates a detail of the mechanism according to the-inventionon larger scale;

Figs. 17 and 18. illustrate thewormgearing 8| and 82 on a larger scale.

Like parts are designated by like: numerals in:

all figures of the drawings.

Referring more particularly to Figs. 1 to 4 of the drawings; numerals Iand 2 designate the side walls ofthe containerof the dobby which wallssupport the-'dobby' mechanism; Harness operating lever 3 is supportedby' shaft 4 which forms the fulcrum for the lever, the latter being"provided'with two rollers or cam followers 5 and 6 running on cam i.This portion of'themecha nism" as well'as the means connecting levertrend the harness frames i's as shown in the patent of- AlbertMoessing'e'r, No.' 2,592,820'1of April 15,..19'52. Character of movementof the harness frames depends on the configuration of. cam l. The:movement is positive. up as well. as. down, be-

cause of the provision. of two. cam followers 5;

and. 6,, each being in engagement with its own portion of 0am I.Tworecesse'sare provided on the cam for temporarily arresting theharness in its extreme positions. The-recesses x-are'so posipan ingspecification. and claims and shown in the.- drawings, which by wayofillustrationshow tioned that when one roller, 6 in Fig. 1, is inarecess, the other roller; 5 in-Fig 1,-is on apro tuberance of cam 1whereby any play of lever 3 is prevented.

Instead of providing recesses in cam I cooperating with followers and 6,recesses y as shown in Fig. may be arranged which cooperate with afollower roller I25 on an angle lever I26 whereby a spring I21 assuresengagement of roller I25 with cam 'I. Lever I26 is swingably supportedon the dobby frame.

Cam I is supported by shaft 8 forming a stationary fulcrum. Cam I hastwo actuating or hook members 9 and I0 swingably connected therewith.Link members II and I2 individually movably connect members 9 and IIIwith the end of one arm of switching lever I3 which is swingable onshaft or swing axis I4, which forms a stationary fulcrum, a motioncontrol rod I5 being pivoted to the other arm of lever I3. Members IIand I2 and the switching lever I3 constitute what I call the switchingmechanism. Lever I3 is held in its rest positions by a latch I6 mountedon shaft I9 and having two notches II and I8 adapted to engage one endof the lever against which the latch is pulled by a spring connecting astationary part of the (lobby mechanism frame and the latch l6.

One arm of a positioning lever 22 which lever has the shape of a bellcrank lever and swings about a shaft 23 is hooked in a slot 2| intheupper end of control rod I5. The upper, horizontal, arm of lever 22carries a weight 24 as shown in Fig. l, or is pulled counterclockwise bya spring 24' as shown in Fig. 9. A pattern card feeler 25 hangs on thehorizontal arm of lever 22, which can be seen better in Fig. 6. Thefeelers 25 extend through and are guided by apertures in plates 26 and26. Control rod I5, lever 22, and the feeler 25 constitute what I termthe control mechanism.

I Each harness has its own switching and control mechanism, as describedabove, which mechanisms are placed between the side walls I and 2 of thecasing containing the dobby.

Actuating bars 30 and 3| are disposed symmetrically with respect to animaginary plane extending through the axes of shafts 8 and I4 formingthe swing axes for the actuating means 9 and the second actuating meansI3, respectively, and it is sufficient-to explain the function of theupper bar 30 only. Its ends are rigidly connected with one end ofhorizontal rods 32 and 33 which extend at a right angle to bar 38. Therods 32 and 33 are provided at their other ends with pins 34, 35 and 36,37, respectively, to which links 38, 39 and 40, 4| are pivoted,respectively. Links 38 and 40 swing about shaft I4 and links 39 and 4|about shaft 8. This limits movement of bar 30 parallel to itslongitudinal axis on an imaginary cylinder surface or an arcuate path27. Likewise, bar 3| moves on the surface 28 of an imaginary cylinder.

The pins 35 and 31 of rods 32 and 33, respectively, are connected byconnecting rods 43 and 44" to cranks 45 and 46 of a shaft 47 and arereciprocatingly moved 'to and from their end positions I06, I08 and I01,I09 on the arcs 21 and 28. Shaft 41 is connected to and operated by theloom drive by means of a chain 48 and a sprocket wheel. Spur gear wheels49 and 50 drive crank shaft 5| which operates the actuating bar 3|, Fig.2. The bars 30 and 3| perform what I call translatory movements wherebyall points of the bars travel along parallel paths of equal length whichare not necessarily straight. The axis of members 8, I4, I06, and H9,and 8,

I4, I01, and I20 are at the corners of parallelograms in the deviceaccording to the invention. See Fig. 1.

The draw bars and 56 are guided in slots 5'1 and 58 of the guide members59 and 60 which are fixed to the walls I and 2. The ends of the drawbars 55 and 56 are provided with pins GI and 62, respectively, whichextend individually into slots of one end of two arm levers 63 and 64and 63' and 64', Figs. 2 and 4. The two arm levers are supported by ashaft 65 and have at their ends cam followers 66 and 61, and 66 and 61,respectively, which engage the cams 68 and 69, and 68 and 69 Tensionsprings 10, Fig. 2, assure engagement of the cam followers and cams.

The cams 68, 69, 68, 69' are so formed that the draw bars 55 and 56 arealways moved in opposite directions in their guides 51 and 58. Duringone revolution of cam shaft II bars 55 and 56 move once up and oncedown. Shaft II is driven by crank shaft 41 through spur gear wheels 49,I2 and 13.

Control rod I5 extends between the draw bars 55 and 56 and has recessesat its sides which are adapted to receive the draw bars. The length ofthe recesses 01. between their end abutments I30 and I3I, Fig. 14, isgreater than the height of a draw bar 55 or 56 plus b of the stroke ofsaid bars. This permits idling of the bars in slots 57, 58 for thepurposes which will be explained later. The depth d of a recess plus thewidth e of rod l5 between the recesses is smaller than the distance Jbetween the bars 55 and 56 to assure that always one only of the drawbars engages the control rod I5 for lifting or depressing it. The sum ofthe depth d of the recesses plus the width e of rod I5 between therecesses is greater than the distance 1 between the draw bars 55 and 56to always assure engagement of a recess by a draw bar. For properoperation of the mechanism the following equations must be fulfilled:

Shaft 83 of the pattern card drum 11, Fig. 1, is driven by shaft IIthrough the bevel gear wheels I8, I9, the shaft 80, Fig. 4, a worm 8| onthe shaft and the'worm wheel 82 which is rigidly connected with shaft83, Figs. 4 to 6. Whenever worm 8| makes one complete revolution, duringa determined angle, Fig. 19, wheel 82 is rotated through an angle t,Fig. 1, the extent of which depends on the configuration of the cam I35on member 8|. The worm gearing 8| and 82 is shown in detail in Figs. 16to 18. During the part of revolution of shaft 80 when worm 8| does notmove wheel 82, thepattern card drum I1 stands still. During the periodthe drum is rotated through angle t, the feeler 25 is lifted out ofpattern card T! by a lifter 86.

As seen in Fig. 3, the lifter 85 is connected to one end of two-armlevers 97, 98 swinging about shaft 99. The other ends of said two-armlevers are pivoted to link members and 96, Figs. 5 and 6, which are alsopivoted to elbow levers 93 and 94, respectively, on shaft 90. The latteris revolvably borne in side walls I and 2 and has a crank 89 atone endwhich crank carries a cam follower 88 which follows a groove in drum 8'!fixed to shaft 80. To levers 93 and 94 further link members I00 and |0|are pivoted which actuate the short two-arm levers I02 and I03 whichalso swing on shaft 99.

' As shown inFig. 3, the short two-arm levers I02; vIflt'carry; the.shaft 23 which supports the positioning levers, 22. If shaft 23- wouldbe immovable; lever 22 would be bent upon lifting of the feelers 25because the device is so constructed that control rod I5 engages, drawbar to when the respective feeler rests on card IT, Fig. 9. To. preventbending. of member 22 its fulcrum is lifted by levers me, its wheneverlifter 86 is moved toposition 85.

#LifterxSfizand shaft 23, forming the fulcrum of lever 22;aresimultaneously moved up and down by cam 81. .When roller 88,- whichfollows cam. 8"I:,.is moved to the right in Fig. 5, bellcrank lever8-9.,.93 turns counter clockwise, pulling linksv I and 95 downandturning levers QIand I02 clockwise. -This causes upward movement oflifter 86 as; wellas of fulcrum 2.3. lifter.- 86 causesv lifting offeelers25 out of their holes in-the pattern card TI and clockwisemovementof. levers 22 about fulcrum 23 and movement of. controlrod Ifrom its right position (Fig. 1) to its left, position (Fi 9). Clockwisemovement of be'llcrank lever 89, counter-clockwise movement of leversilland I02 and downward movement of lifter B16 and fulcrum 23*. If a.feeler 25.1 is, above a hole in the pattern cardat thismoment, thehorizontal arm of lever 22,: supporting said. feeler follows thedownward.

movement-tor lifter- 86, because of weight 24 or spring 2.4., andlever-22 turns counter-clockwise about fulcrum 23,v moving rod I5 fromits left to itsrightposition. If; there is no hole below feeler 25, thehorizontal arm of its lever 22 cannot follow thedownwardmovement oflifter 86 and the lever remains in the, position in which rod I5 is inits left, position. I

The mechanism operates as follows: The'card drum] I makes; an angularmovement t; corresponding to one section of pattern card 'terpositionsand then back tofcentral position.

During this movement of draw bars 55,, 55 the actuating bars 39, 3| areeither in their dead center positions. I06, I01 or I08, I09. Fig-., 3;,revolves twice as fast as crank shaftc'l.

The dobby according to the inventionoperates according to. the followingrule: No hole in card-.11" will be followed by a depressed heald frame;hole is followed by a raised heald frame, orv-iceversa, according to thetype of connection of lever 3. with the'heald frame. In the mechanismaccording to the invention illustrated in Figures land '7 to 13 no holein the pattern card causes clockwise movement of lever 3' and Upward.movement of- 93 causes Shaft 80,

of bar 3| to the right, arrow III, bar 3I sliding I moves down andcauses disengagement of .member Qfrom bar through switch lever I3 andlink I I, as seen in Fig. 7. During the movement hole on the patterncard, has not changed its position. I.

If; the heald frame is to retain its up position. there must again be ahole in the pattern card so that rod I5 is again pressed to-the rightfor"en-' gagement with bar 55 which will make an up stroke that does notmove rod l5 which is already in the up. position,. Fig. 8, as the lengthof: the recesses in rod ii: are greater than the heightof bars. 55, 56.If then bars 30 and 3| return to positions I56, lfil, bar 36 glidesalong guidesur:

face portion. I it of member 9 and swings it up in the direction ofarrow H4 to the position shown If theharness must retain the raised.

in Fig. 7. position, the following stroke down of bar 55. does notaffect the, position ofthe harness, as rod I5is in its lower; position.

The following is a description of what happens:- when the heald frame isto be moved-from the.

raised to the depressed position and stays therein.

From the position shown, in Fig. 1, lever-3 must be moved clockwise fordepressing the. heald frame connected therewith, and there must be. nohole in thepattern card when it is advanced for preparing this movement.Rod I5 is then depressed heald, and hole causes counterclockwisemovement of 1ever3 and raised heald. When the; shed is changed eithermember 9 or ID is in engagement with bars 35; or 3-I What happens whenthe harness is and stays in theraised position will, be described first.In the positionshown in Fig, 1, finger or feeler 25 is .inserted inaholeof the pattern card and lever 3- is=in;its left position during thefollowing pick,

1. e; lever 3 will stay in the position shown in Fig. 1. Rod I5. ispushed tothekright by lever 22. and to engagement withbar 55.. The.latter.

moved to the left and bar 58 can move upwardly without affecting members9 and IIlwhich are in the position illustrated in Fig. 1.. Due to the,

movement of bars 38, (H to the right the system.

the-position shown in Fig. 10 whereby member 9 is swung up and out ofengagement with bar 30. which is in the position Hi8. At the return ofbars 3t, 3.! to: positions I06, I01, bar-3I pushes member it .down bysliding on its guidesurface portion IIii whereby the system is switchedto the position. according to Fig. 11. I

, If,;.after the pattern'card has made a further angular movement t,there is again no hole in. card 1? members 9 and I0 will not alter theirpositionsas bar 5&- can make an idle stroke up.

Atthe movement of bar 35 to the right itswings: member 9 up by slidingalong its guide surface portion I I5. whereby the position shown in Fig;1( is reproduced. 1 V

For a-change from depressed harness-position corresponding. to Fig. 11to: raised position,. i. e for :moving: lever 3 over to the left, a holein the; pattern .card must be presented to feeler 25 whereby rod I5 ismoved to engagement with bar 55 and pushed down by it and the conditionof the deviceshown in Fig. 12 is 'produced- Now,

bar 3! will move member It to the right whereby J cam? and' with itlever 3 is moved counterclockwise to the position of Fig..13;

7 If. from the position shown in Fig 13 thetnextposition of the harnessshall be the depressed one, no hole must be in the pattern card so thatlever 3 will be moved clockwise. Then rod [5 is swung to the left andbar 56 can make an idle stroke down whereby member it remains engagedwith bar 3| and the apparatus is brought to the condition shown in Fig,12 when bars 30, 3| have been moved to the left. The harness is therebymoved into the depressed position.

If, however, from the position of Fig. 12 no change of the heald framemust occur, there must again be no hole in the pattern card.

If there is a hole in the pattern card at the motion after the conditionaccording to Fig. 13, no change of the shed will take place. Rod l5 isthen in position where it engages bar 55 and will-be lifted therebywhereafter the system is in the condition according to Fig. 8. Bars and3|, can idle to the left and the system assumes the condition shown inFi 7.

- The dobby can operate forward as well as backwards. This is ofadvantage if in case of a failure already inserted weft threads must beremoved. In this case the dobby is operated in reverse, at first intothe last previous picking position and then pick by pick till the faultypick is reached.

Fig. 1'7 shows the worm 8| as in Fig. 3 but in a greater scale. Theshaft 80 makes one revolution during one picking cycle and rotates theworm wheel stepwise by the pitch 1? of the pattern card drum 1'!(Fig. 1) in the following manner. The drum 11 can only be rotated whenthe feelers 25 are lifted out of the pattern, therefore the ends I34 andworm tooth I35 (Fig. 17) are lying within the centri-angles a. and ,8(Fig. 18) in two parallel planes in a right angle to the shaft 89. Thusduring the rotation of the shaft 80 within the angles a and ,8, there isno rotation of the worm wheel 82; rotation of the worm wheel is causedby the passover part 133 of the worm tooth I35 which extends within theangle '7, Fig. 16.

While I believe the above described embodiments of my invention to bepreferred embodiments, I wish it to be understood that I do not desireto be limited to the exact details 'of method, design and constructionshown and described, for obvious modifications will occur to a personskilled in the art.

I claim:

I l. A dobby for positive actuation of the shedding mechanism in loomsfor weaving, comprising a harness operating member, a cam engaging saidmember, two actuatin members individually pivoted to said cam foractuating it, and two positively driven actuating bars individuallyengageable with said actuating members and actuating same when inengagement therewith.

- 2. A dobby as defined in claim 1 in which said operating member isprovided with two cam followers for engagement with said cam.

' 3. A dobby for positive actuation of the shedding mechanism in loomsfor weaving, comprising a harness operating member, a cam swingableabout an axis disposed within and at a right angle to said cam, twoactuating members individually pivoted to said cam for swinging it aboutits axis, two positively driven actuating bars individually engageablewith said actuating members and actuating same when in engagementtherewith, a switching lever swingable about an axis extending at rightanl32 of the 8 gle thereto, two link members individually swingablyconnected with one end of said switching lever and pivoted,individually, to'

said actuating members and placing same for engagement or disengagementwith said actuating bars depending on the position of said switchinglever; the swing axes of said switching lever and of said cam, and thepivot on said switching lever of one of said link members when placingsame for engagement of one of said actuating members with one of saidactuating bars being in one plane.

'1. A dobby as set forth in claim 3, comprising two more link members,each of said last mentioned link members having one end swingable aboutthe axis of said switching lever and having another end swingablyconnected with one of said bars, the individual distances of the swingaxes at one end of said link members from the respective swing and pivotcenters of their other ends and the distances of the pivot centers ofsaid actuating members on said cam from the swing axis of the latterbeing all alike.

5. A dobby for positive actuation of the shedding mechanism in looms forweaving, comprising a harness operating member, a cam engaging saidmember, two actuating members individually pivoted to said cam foractuating it and individually having guide surface portions, and twopositively driven actuating bars individually engaging said guidesurface portions for placing said members in desired operatingpositions.

6. A positively actuated shedding mechanism in looms for weaving,comprising a harness operating member swingable about a fulcrum andhaving two cam follower rollers connected therewith, a cam swingableabout a fulcrum and having a surface portion engaging said rollers, saidsurface portion having two recesses individually accommodating saidrollers when said operating member is in an extreme operating positionfor temporarily arresting the mechanism, two actuating membersindividually pivoted to said cam for actuating it, and two positivelydriven actuating bars individually engageable with said actuatingmembers and actuating same when in engagement therewith.

7. A dobby for positive actuation of the shedding mechanism in looms forweaving, comprising a harness operating member, a cam swingable about afulcrum, two actuating members individually pivoted to said cam forswinging it about its fulcrum, two positively driven actuating barsindividually engageable with said actuating members for actuating samewhen in engagement therewith, a positively oscillated switching lever,two link members individually pivoted to one end of said switching leverand to said actuating members and placing same for engagement anddisengagement with said actuating bars depending on the position of saidswitching lever, and latch means slideably engaged by said switchinglever for temporarily holding it in its extreme operating positions.

8. A dobby as defined in-claim '7, said switching lever having two arms,said link members being pivoted to one of said arms, said latch meanshaving the form of a lever having two notches, the other arm of saidswitching lever having an. end portion formed to be inserted in one ofsaid notches at a time, and a spring pressing said latch lever to saidend portion.

ing a harness operating member, a cam swingable about a fulcrum, twoactuating members individually pivoted to said cam for swinging it aboutits fulcrum, positively driven actuating Y bars individually engageablewith said actuating members for actuating same when in engagementtherewith, a switching lever, two link members individually pivoted toone end of said switching lever and to said actuating members andplacing same for engagement and-disengagement with cam-actuatedmemberpivoted to each of said draw bars and adapted to reciprocate said drawbars in opposite directions parallel to themselves.

10. A dobby as defined in claim 9,'said recesses having each an abutmenton each end thereof for engaging one or the other side of a draw bar,the distance between said abutments of one recess being greater than theheight of a draw bar plus the extent of halfof the stroke of said bar.

11. A dobby as defined in claim 9, the depth of one of said recessesplus the; thickness of said control rod between said recesses beingsmallerthan the distance between said draw bars.

. said actuating bars depending on the position of individually pivotedto one end of said switching lever and to said actuating members andplacing same for engagement and disengagement with said actuating barsdepending on the position of said switching lever, and a control rodpivoted to said switching lever and having two oppositelypositioned'recesses, a draw bar disposed on either side of and at aright angle to saidcontrol rod adjacent said recesses and adapted to betemporarily engaged thereby, two levers pivoted individually to saiddraw bars and extending at a right angle'thereto, eachlever having a camfollower roller connected therewith, two. rotating cams individuallyengaging said rollers and being so formed as to actuate said levers tomove said draw bars parallel to themselves and simultaneously inopposite directions from and to central position in which they areadjacent,

ing and advancing said card, a lifter abutting I said positioning leverand adapted to lift it for lifting said feeler out of an aperture in thepattern card, and drive means common to said drum and said lifter andadvancing said drum after said lifter has removed said feeler from theaperture in which it was inserted. 14. A dobby asset forth in claim 9,comprising a positioninglever movably connected to said control rod andmoving said rod to engagement with one or the other of said draw barsdepending on the position of said positioning lever, a pattern cardfeeler depending from said lever, a pattern card having aperturesadapted to receive said feeler, a revolvable drum supportirw andadvancing said card, a lifter abutting said positioning lever andadapted to lift it for lifting said feeler out of an aperture in thepattern card. a shaft supporting said positioning lever. displaceablesupport means supporting said shaft, and actuating means connected withand actuating said lifter and connected with and simultaneouslydisplacingsaid support means.

15. A dobby for positive actuation of the shedding mechanism in loomsfor weaving, comprising a harness operating member, a cam swingableabout a fulcrum, two actuating members individually pivoted to said camfor swinging it about its fulcrum, two positively driven actuating barsindividually 'engageable with said actuating members for actuating samewhen in engagement therewith, a switching lever, two link members 16. Adobby as set forth in claim 15, said-r0 tating cams being so formed asto move said draw bars alternately.

17. A dobby for positive actuation oithe shed: ding mechanism in loomsfor weaving, comprise ing a harness operating member, a cam swingableabout afulcrum and engaging said member, two actuating membersindividually pivoted to said cam for swinging it about its fulcrum, twoactuating bars individually engageable with said actuating members foractuating same when in engagement therewith, a switching lever,'two linkmembers individually pivoted to one end of said switching lever and tosaid actuating members and placing same for engagement and disengagementwith said. actuating bars depending onthe position of said switchinglever, a control rod pivoted to said switching lever and having twooppositely positioned recesses, a draw bar disposed on either side ofand at a right'angle to said control rod adjacent said recesses andadapted to be temporarily engaged thereby, two

levers pivoted individually to said draw bars at a right angle thereto,each lever having a cam fol lower roller connected therewith, two camsine dividually engaging said rollers and being so formed as to actuatesaid levers to move said draw barsin' opposite directions from and to acentral position, a rotating shaft supporting said cams, drive meanscommon to said shaft and to said actuating bars and rotating the formerand sub-' ating bars have reached an extreme operating position.

18.-A' dobby for positive actuation of the shedding mechanism in loomsfor weaving, comprising a harness operating member, a cam swingableabout a fulcrum and engaging said member, two actuating membersindividually pivoted to said cam for swinging it about its fulcrum, twoactuating bars individually engageable with said actuating members foractuating same when in engagement therewith, a switch-- ing lever, twolink members individually pivoted lever and having two oppositelypositioned recesses, a draw, bar disposed on'either side'of and at aright angle to said control rod adjacent said recesses and adapted to betemporarily engaged thereby, two levers pivoted individually to saiddraw bars at a right angle thereto, each lever having a cam followerroller connected therewith, two cams individually engaging said rollersand being so formed as to actuate said levers to move said draw bars inopposite directions from and to a central position, a positioning leverhaving one arm movably connected to said control rod for laterallyswinging it into and out of engagement of one of its recesses with oneof said draw bars, a pattern card feeler movably connected with theother arm of said positioning lever, a substantially reciprocatinglymovable feeler lifter abutting said other arm for swinging said leverand its feeler out of card engagin position, a shaft displaceableparallel to itself in the direction of movement of said card feeler andswingably supporting said positioning lever, and drive means connectedwith said feeler lifter and said last shaft for simultaneously movingsaid feeler lifter and displacing said shaft.

19. A dobby for positively actuating the shedding mechanism in looms forweaving, comprising a harness operating member, actuating means engagingsaid member, a translatorily moving member, and a hook member having oneend movably connected with said actuating means and having a hooksubstantially at its other end and adapted to be engaged by saidtranslatorily moving member; both ends of said hook member performing atranslatory movement conforming with that of said translatorily movingmember, when the latter engages said hook member.

20. A dobby for positively actuating the shedding mechanism in looms forWeaving, cornprising a harness operating member, actuating meansswingable about a stationary fulcrum and engaging said member, atranslatorily moving member, a hook member having one end pivotallyconnected with said actuating means and having a hook substantially atits other end and adapted to be engaged by said translatorily movingmember, and second actuating means swingable about a stationary fulcrumand movably connected with said hook member; said fulcrums, said hookand the pivot axis of the pivotal connection of said hook member andsaid first actu'-. ating means being disposed at the corners of animaginary parallelogram at all operating positions of said mechanismwhen said hook is engaged by the translatorily moving member.

21. A dobby for positively actuating the shedding mechanism in looms forweaving, comprising a harness operating member, actuating meansswingable about a stationary fulcrum and engaging said member, atranslatorilymoving member, a hook member having one end pivotallyconnected with said actuating means, and having a hook substantially atits other end and adapted to be engaged by said translatorily movingmember, a lever swingable about a stationary fulcrum, and a link memberswingably connected with one end of said lever and With said hook memberfor swinging the latter in and out of engagement with said translatorilymoving member depending on the position of said lever; the axes of saidfulcrums and the swing axis of the connection of said link member withsaid lever being disposed in an imaginary plane when said hook isengaged by said translatorily moving member.

22. A dobby for positively actuating the shedding mechanism in looms forweaving, comprising a harness operating member, actuating means engagingsaid member and swingable about a stationary fulcrum, a memberreciprocating along an arcuate path, and a hook member having one endmovably connected with said actuating means and having a hooksubstantially at its other end and adapted to be engaged by saidreciprocating member; the radius of said arcuate path being equivalentto the distance between said stationary fulcrum and the point where saidhook member is swingably connected with said actuating means.

ERWIN PFARRWAILER.

Number Name Date Zollikofer Mar. 30, 1948'

